Re: [HSS] Coil polarity

Unknown
Unknown
in Hudson 1916 - 1929







I've read the same test many times, and always
forget which way the flare should go!   It's the sort of thing if you
are doing all the time, you just automatically know, but when you only do it
about once in ten years, you have to tryand dredge the ifo up again. 
 Thanks for the input.

Geoff.

----- Original Message -----



Sent: Monday, November 27, 2006 3:32
PM

Subject: [HSS] Coil polarity


When installing the coil, I was unable to find ant
reference to polarity in the Hudson wiring diagrams. A quick google found this
bit below from the Chicagoland MG Club.

Paul O'Neil
SoCal
1926 Hudson Anderson
Coupe
1929 Hudson Town Sedan
1939 Cadillac Coupe (How'd that get in
here?)

www.cichet.us
www.aeromark.net

&&&&&&&&&&&&&&&&&&&&&

Coil
Polarity
I was converting my older British car over from positive to
negative ground when I came across the question of coil polarity. I discovered
coil polarity is very much misunderstood. In researching it, I was very
confused until I found out there are two definitions of coil polarity. I
talked to three or four knowledgeable people on the subject and read several
technical books and articles. Everything made sense in itself but didn't jive
together until I found out they were talking apples and oranges.


Definition #l Coil Polarity (In relation to battery)


The
polarity of the coil should match that of the battery by connecting it so (+)
goes to (+) and (-) connects to (-). But don't worry about which way you
install the battery (positive or negative ground) or which way you install the
coil (regardless of coil markings) it will automatically adjust itself. The
coil will work efficiently and put out the same voltage either way it is
hooked up, but the spark plugs are more sensitive when it comes to polarity,
hence our second and more important definition.

Definition #2 Coil
Polarity (In relation to spark plugs)

Coil polarity should be such so
as to provide negative polarity to the spark plugs center electrode.


It has been found that it takes approximately 15% less voltage to form
an arc at the plugs, if the hotter center electrode is negative, and the
cooler (by comparison) ground electrode is positive. The center electrode is
hotter since heat transfer from the tip must make its way through the
porcelain insulator past the sealing gaskets to the shell block and then to
the water jackets.



If your center electrode is positive, your
car will probably still run fine until, with its 15% handicap, it exceeds the
coil output. If you live where temperatures dip down to 0
This discussion has been closed.

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